Show help for query-proposal-votes when no arg provided

[hqueue]

Describe your changes

Show help message for query-proposal-votes subcommand instead of crashing when no arg provided.

Before (crashed with panick)

$ ./namadac query-proposal-votes
The application panicked (crashed).
Message:  called `Option::unwrap()` on a `None` value
Location: crates/apps/src/lib/cli/utils.rs:204

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

After

$ ./namadac query-proposal-votes
Query votes for the proposal.

Usage: namadac query-proposal-votes [OPTIONS]

Options:
      --node <node>                Address of a ledger node as "{scheme}://{host}:{port}". If the scheme is not supplied, it is assumed to be TCP.
      --proposal-id <proposal-id>  The proposal identifier.
      --voter <voter>              The address of the proposal voter.
  -h, --help                       Print help

Indicate on which release or other PRs this topic is based on

v0.31.4

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (9181fbe) 53.38% compared to head (58a67b0) 53.38%.
Report is 8 commits behind head on main.

Files	Patch %	Lines
crates/apps/src/lib/cli.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2611   +/-   ##
=======================================
  Coverage   53.38%   53.38%           
=======================================
  Files         302      302           
  Lines      103398   103399    +1     
=======================================
+ Hits        55203    55204    +1     
  Misses      48195    48195           

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